JavaScript 75 Interview Curriculum

Implement Array.prototype.myAt — return the element at a given index, supporting negative offsets from the end.

Implement Array.prototype.filter from scratch as a method on the array prototype.

Implement a custom Array.prototype.square method that returns a new array with each value squared.

Implement a function that consolidates rows sharing the same user into a single grouped record.

Implement a function that joins an array of strings into a grammatical list with commas and a conjunction.

Implement a function that wraps occurrences of a search term within a string in highlight markup.

Implement a function that delays invoking another function until a specified period of inactivity has passed.

Implement a factory that takes a starting integer and returns a function that returns the next value on each call.

Implement a function that returns a promise resolving after the specified number of milliseconds.

Implement a function that limits how often a wrapped function can be invoked within a time window.

Implement a simplified cva that builds class names from base styles, variant tables, and default values.

Implement a function that transforms a multi-argument function into a chain of single-argument calls.

Extend debounce with cancel and flush methods to abort or immediately invoke pending calls.

Implement Function.prototype.myBind — return a new function with a fixed `this` and optional preset arguments.

Implement a function that caches results of a single-argument function so repeat calls return instantly.